Furnace construction



Feb. 7, 1933. J THORNTON 1,896,116

FURNACE CONSTRUCTION Filed Feb. 6, 1931 :5 6&2

:: ii :i 5

I INVENTOR. 0 071 Tfiorni'vfl BY I - ATTORNEK:

Patented Feb. 7, 1933 UNITED STATES JOHN THORNTON, or younesrowri, am

FURNACE CONSTRUCTION. 7

Application m February a, 193 isrial'm. 518,830..

This invention as indicated relates to a furnace construction, moreparticularly it comprises a construction es ecially adapted for use withthe furnace c arging'openings of open hearth furnaces, but it is not tobe limited to such use inasmuch asit is suitable for various types ofindustrial furnaces wherein it is desired to protect the wall andskewback, of the furnace from the destruc- 10 tive effects of heat atthe point of connection of the door frame with the furnace.

It has heretofore been the practice to place Such brick has only alimited length of service before deteriorating and. frequent replacingof the same is necessary.

The present invention has for its principal object the provision of afurnace construction wherein the charging opening is provided with aframe which is suitably water cooled, said frame being formed with anextension so spaced from the wall structure of the furnace as to providefor a space which may be filled with a material very highlyheat-resistant, and which will last almost. indefinitely under verysevere service. Another object of the invention is to provide asupporting means, for a plastic material highly heatresistant incharacter, which will have a locking and positioning effect on the sameand prevent its becoming displaced through vibration or shock such asoccasionally is imparted to the door frame of a furnace by the chargingapparatus. Other and further objects of the invention will appear in thecourse of the following description. To the accomplishment of theforegoing and related ends, said invention, then, consists of the meanshereinafter fully described and particularly pointed out in the claims.

The annexed drawing and the following description set forth in detailcertain mechanism embodying the invention, such disclosed meansconstltuting, however, but one of various mechanical formsin which theprinciple of the invention may be used.

, In said annexed drawing:

Fig. 1 is, a perspective view-showing one fojrrnoof furnace constructionembodying the principles of theinvention; Fig. 2 is a similar viewshowing a slightly modified form of construction. I I As is clearlyshown in the drawing, the furnace 1 comprises the usual side walls (notshown) and a roof structure 2, the roof struc- .7 ture being supportedupon a channel skewback 3 having a flange 4 atits lower edge upon whichthe units forming the roof structure are supported. The furnace doorframe is positioned in front of said channel skewback, being supportedchiefly by. its own weight. 'The door frame as illustrated com prisestwo upright side frame members 5, the

upper ends 6 of which preferably extend slightly above the lower edge ofthe skewback. At a point spaced from saidupper ends and slightly belowthe loweredgeof the skewback, across member 7 of the door frame isprovided, said cross member having a rearward extension 8 which isadapted to enter the furnace proper. This rearward extension is madepreferably as an integral part of the door frame and is adapted to.receive the cooling-water in its course of circulation through the doorframe.

The cooling water is admitted to one side member of the door framethrough a pipe 11 which preferably extends to a point adjacent its lowerend. A similar pipe 12 is positioned in the other side member of thedoor frame and'servesto receive the water circulated through thestructure andcarry it to a point of discharge. The extension on the doorframe, as stated, is in a rearward direction'entering within theinterior of the furnace and is of such extent that it projects not onlybeyond the channel skewback, but

beneath the refractory materials forming the roof structure supportingthereon.

The extension on the door frame preferably is inclined upwardly, as isshown more'particularly in Fig. 2 of the drawing, and may be curved orgiven any desired configuration to engage throughout all, or a portionof its extent so as to provide a slight wedging action upon the packingmaterial 13 of heatresisting quality which is engaged above the same.This packing material, preferably comprises chrome ore particles whichwithstand substantially twice the amount of heat as ordinary silicabrick will withstand. WVhen the door frame is placed in position, thespace immediately above the extension is filled with the chrome ore inplastic form which is rammed solidly into position not only beneath thelower edge of the skewback, but also beneath the forward portion of theroof structure or forward wall structure, as the case may be, as hasheretofore been indicated.

Other modes of applying the principle of my invention may be employedinstead of the one explained, change being made as regards the mechanismherein disclosed, provided the means stated by any of the followingclaims or the equivalent of such stated means be employed.

I therefore particularly point out and distinctly claim as my invention:

1. A furnace structure comprising a skewback support, an arched roofstructure engaged upon said skewback, a hollow watercooled frame for afurnace door beneath said skewback, such frame comprising a pair ofupright members and a connecting supporting member projecting upwardlyand rearwardly in spaced relation beneath said skewback and itsassociated arch, said upright members being positioned outwardly of thefront wall of the furnace with their upright ends overlapping'theforward face of said skewback, and a single layer of fire-resistantpacking material interlockingly engaged in the space between said archand said rearwardly and upwardly inclined supporting member and behindadjacent structural elements and adapted to be forced while plastic intosaid rearwardly decreasing space between said frame and said archthrough wedging action when rammed thereinto from a point outside thefront wall of said furnace.

2. A furnace structure comprising a skew- 7 back support, an arched roofstructure engaged upon said skewbaclr, a hollow watercooled frame for afurnace door beneath said skewback, such frame comprising a pair ofupright members and a connecting supporting member projecting upwardlyand rearwardly in spaced relation beneath said skewback and itsassociated arch, said upright members being positioned outwardly of thefront wall of the furnace with their upright ends overlapping theforward face of said skewback, and a single layer of fire-resistantpacking material interlockingly engaged in the space between said archand said rearwardly and upwardly inclined supporting member and behindthe upright members and adapted to be forced while plastic into saidJOHN THORNTON.

